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Published clinical pharmacokinetic studies comparing IM injection sites show that peak plasma concentration (Cmax) values can vary by 1525% between different IM sites for the same compound and dose, making site consistency critical for reproducible subcutaneous vs intramuscular peptide injection research outcomes

None of that makes it worthless

What the evidence shows : GHK-Cu has a more established safety and efficacy profile than BPC-157 or TB-500

However, the IM route was the top-ranked statistically, followed by the SL and then the oral routes, but without clinical significance

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